.middle {
    width: 1000px;
    display: flex;
    justify-content: center;
    margin: 50px 0;
}

body > div:nth-child(2) {
    display: flex;
    justify-content: center;
}

.middle > div {
    width: 900px;
    border: 1px solid rgb(230, 145, 55);
}

.online-content {
    padding: 10px;
    border-top: 1px solid rgb(230, 145, 55);
}

/*-------------------------------*/
.online-content > div:nth-child(1) > div:nth-child(1) {
    text-align: center;

}

.online-content > div:nth-child(1) > div:nth-child(1) > div:nth-child(1) {
    display: flex;
    justify-content: center;
}

.online-content > div:nth-child(1) > div:nth-child(1) > div:nth-child(1) > div {
    display: flex;
    align-items: center;
}

.online-content > div:nth-child(1) > div:nth-child(1) > div:nth-child(1) > div > div:nth-child(1) {
    color: rgb(230, 145, 55);
    font-size: 35px;
}

.online-content > div:nth-child(1) > div:nth-child(1) > div:nth-child(1) > div > div:nth-child(2) {
    color: gray;
}

/*---------------留言内容-----------------*/
.online-content > div:nth-child(2) {
    display: flex;
    justify-content: center;
}

.online {
    /*border: 1px solid red;*/
    width: 600px;
}

.online > div:nth-child(1) > div > div:nth-child(1) {
    line-height: 30px;
}

.online > div:nth-child(1) > div > div:nth-child(2) {
    /*height: 30px;*/
    /*background-color: rgb(238, 238, 238);*/
    /*border: 1px dashed gray;*/
    /*line-height: 30px;*/
    /*padding: 0 10px;*/

}

input[text=a] {
    height: 30px;
    line-height: 30px;
    padding: 0 10px;
    width: 600px;
    background-color: rgb(238, 238, 238);
    border: 1px dashed gray;
}

textarea {
    width: 618px;
    height: 100px;
    background-color: rgb(238, 238, 238);
    border: 1px dashed gray;
}

/*.online > div:nth-child(1) > div:nth-child(3) > div:nth-child(2) {*/
/*    height: 100px;*/
/*    line-height: 20px;*/

/*    overflow: scroll;*/
/*}*/
input[type=submit] {
    margin: 20px 0;
    padding: 10px 40px;
    background-color: rgb(230, 145, 55);
    border: none;
    cursor: pointer;
    border-radius: 0 30px 30px 0;
    box-shadow: 1px 1px 2px 2px red;
}

.online > div:nth-child(2) {
    display: flex;
    justify-content: center;
}
